Children with developmental disabilities often exhibit problem behaviors, such as physical aggression, tantrums, and self-injury. These behaviors can detrimentally affect the family's lifestyle. Research has shown that such families should take an active role in developing and implementing a behavior plan. However, families need support to promote effective changes in their child's behavior. This study investigated how a positive behavior support workshop that used the Family HOPE program affected behavior problems and parent/child relationships in families with children with developmental disabilities. Parents of eight children with disabilities and challenging behaviors participated in this research. A Project Director and Principal Investigator taught the six systematic steps to changing behavior. They were assisted by graduate students who provided behavioral education to families, helped families complete a Functional Behavioral Assessment, appropriate interventions, and analyze intervention data. The Parent-Child Relationship Inventory (PCRI) and Scales of Independent Behavior-Revised (SIB-R) were given to the families to study the effects of parent trainings on parents' perceptions of limit setting, parental support, and the frequency and severity of problem behaviors. Results showed a significant difference in the pre- and post-intervention data on limit setting and parental support. There were no significant differences in the frequency and severity of problem behaviors on the SIB-R. Implications for further research are suggested concerning teaching parents Positive Behavior Support principles in a workshop setting.